I am due March, 12, 2014, I am currently 26 weeks could I have gotten pregnant on or around may, 23, 2013?

Conception dates are estimates and based on information you provide. Or average size of fetus. Conception dates are estimates, that are up to two weeks off.

Conception dates are estimates and based on information you provide. Or average size of fetus. Conception dates are estimates, that are up to two weeks off.
So if my due date is march 12, 2014 when did I get pregnant?

Sometime between 28 and 24 weeks ago and May 23 would fall within that period.